/Engine/Plugins/Experimental/ChaosVehiclesPlugin/Source/ChaosVehicles/Public/ChaosVehicleMovementComponent.h
Set the vehicle sleeping (bEnableSleep=true) or wake it up (bEnableSleep=false)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Game|Components|ChaosVehicleMovement") void SetSleeping ( bool bEnableSleep )